Hey, I have been designing a model, and would prefer to make the arms, head ETC. as seperate pieces to allow for posability. I have the hole in the head piece being 4mm across. what is the maximum size that the peg can be to allow for a snug, but moveable fit? Also, as If these models work, I intend to sell them, In the shop menu, is there the option to sell items together? I have seen the models (Salvo ETC.) that are self assemble, and wondered how they where sold.